linux-kernel - Re: [PATCH v14 23/56] media: pci: cx18: Stop direct calls to queue num

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Message-ID: <c4f47aaa-d712-4905-b77d-6fe1b897d94b@collabora.com>
Date:   Thu, 9 Nov 2023 11:07:20 +0100
From:   Andrzej Pietrasiewicz <andrzej.p@...labora.com>
To:     Benjamin Gaignard <benjamin.gaignard@...labora.com>,
        mchehab@...nel.org, tfiga@...omium.org, m.szyprowski@...sung.com,
        ming.qian@....com, ezequiel@...guardiasur.com.ar,
        p.zabel@...gutronix.de, gregkh@...uxfoundation.org,
        hverkuil-cisco@...all.nl, nicolas.dufresne@...labora.com
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-arm-msm@...r.kernel.org,
        linux-rockchip@...ts.infradead.org, linux-staging@...ts.linux.dev,
        kernel@...labora.com, Sergey Kozlov <serjk@...up.ru>,
        Abylay Ospan <aospan@...up.ru>
Subject: Re: [PATCH v14 23/56] media: pci: cx18: Stop direct calls to queue
 num_buffers field

W dniu 31.10.2023 o 17:30, Benjamin Gaignard pisze:
> Use vb2_get_num_buffers() to avoid using queue num_buffers field directly.
> This allows us to change how the number of buffers is computed in the
> future.
> 
> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...labora.com>

Reviewed-by: Andrzej Pietrasiewicz <andrzej.p@...labora.com>

> CC: Sergey Kozlov <serjk@...up.ru>
> CC: Abylay Ospan <aospan@...up.ru>
> ---
>   drivers/media/pci/cx18/cx18-streams.c | 5 +++--
>   1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/media/pci/cx18/cx18-streams.c b/drivers/media/pci/cx18/cx18-streams.c
> index 597472754c4c..cfbc4a907802 100644
> --- a/drivers/media/pci/cx18/cx18-streams.c
> +++ b/drivers/media/pci/cx18/cx18-streams.c
> @@ -104,6 +104,7 @@ static int cx18_queue_setup(struct vb2_queue *vq,
>   			    unsigned int *nbuffers, unsigned int *nplanes,
>   			    unsigned int sizes[], struct device *alloc_devs[])
>   {
> +	unsigned int q_num_bufs = vb2_get_num_buffers(vq);
>   	struct cx18_stream *s = vb2_get_drv_priv(vq);
>   	struct cx18 *cx = s->cx;
>   	unsigned int szimage;
> @@ -121,8 +122,8 @@ static int cx18_queue_setup(struct vb2_queue *vq,
>   	 * Let's request at least three buffers: two for the
>   	 * DMA engine and one for userspace.
>   	 */
> -	if (vq->num_buffers + *nbuffers < 3)
> -		*nbuffers = 3 - vq->num_buffers;
> +	if (q_num_bufs + *nbuffers < 3)
> +		*nbuffers = 3 - q_num_bufs;
>   
>   	if (*nplanes) {
>   		if (*nplanes != 1 || sizes[0] < szimage)